u take a little bit and rub it on ur gums, if ur gums go numb withing 20-30 seconds its probably decent coke although there are agents dealers put in coke to make ur gums go numb for that reason , but its a pretty reliable way
no that is not a pretty reliable way. coke is VERY often cut with other local anaesthestics. the most reliable way is just to snort some.
OK so I have heard of dropping some in a glass of cold water, the cocaine should disolve before it hits the bottom where as impurities will sit on top of the water....another is to burn a little on some silver paper...should leave a light brown residue...anything black/lumpy is crap... But isn't there some liquid chemical you can add that turns it a certain colour if its uncut? Yeah I don't want to 'try it' like they do in the movies!...if your buying in bulk its probably better not to "get high on your own supply"...keep a clear mind for these tricky tasks etc..
sorry but thats really the best way. and testing it with chemicals is pointless as ALL coke you will be getting is cut with something you just don't know how bad its cut. dropping it in water is also pointless because they could cut the coke with water solubles. better try it before you buy it actually and coke will keep your mind clear for those tricky tasks not the other way around.
cocaine should taste bitter as it is a hydrochloride salt but again LOTS of things taste bitter. hey what does your signature say? something about the king of the jews? are you sure that's right? i'm just about fluent in latin and i can't recognize anything but those last two words.
my buddy has an old narcotics "hotbox". Its a wooden box, with a heating element and temp control. It determines the melting point of whatever substance you put on the hotplate. Then you compare your results to a chart. You'd be lucky to find one of these though.
If I learned anything from watching the movie "Blow", it's that pure coke melts at 180 degrees or something like that...